Substituent effect on regioselectivity in the di-π-methane rearrangement: synthesis of disubstituted benzobarrelene derivatives and their photochemistry
作者:Nermin S Ünaldi、Metin Balci
DOI:10.1016/s0040-4039(01)01770-1
日期:2001.11
es 5 and 6 have been synthesized and subjected to triplet-sensitized photoisomerization. 2,3-Dicyanobenzobarrelene 5 gave two di-π-methanerearrangement products 7 and 8 and a [2π+2π]-cycloaddition product 9. However, 2,5-dicyanobenzobarrelene 6 formed a single di-π-methane product 13. The formation of these products is discussed in terms of the radical stabilizing effect of the substituents and the